量子电子学报 ›› 2021, Vol. 38 ›› Issue (6): 838-845.doi: 10.3969/j.issn.1007-5461.2021.06.012

• 量子光学 • 上一篇    下一篇

强度波动下参考系无关量子密钥分发对比研究

杨舜禹, 马海强∗ , 李振华   

  1. 北京邮电大学理学院, 北京 100876
  • 收稿日期:2020-04-17 修回日期:2021-04-15 出版日期:2021-11-28 发布日期:2021-11-28
  • 通讯作者: E-mail: hqma@bupt.edu.cn E-mail: E-mail: hqma@bupt.edu.cn
  • 作者简介:杨舜禹 ( 1994 - ), 云南昆明人, 研究生, 主要从事量子信息与量子光学方面的研究。 E-mail: shunyu.1994@outlook.com
  • 基金资助:
    Supported by Fundamental Research Funds for the Central Universities (中央高校基本科研业务费专项资金资助, 2019XD-A02), Fund of State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications (北京邮电大学信息 光子学与光通信国家重点实验室基金, IPOC2021ZT10); BUPT Innovation and Entrepreneurship Support Program (北京邮电大学研究生创新创业项目, 2021-YC-A315)

Comparative research on reference-frame-independent quantum key distribution with intensity fluctuations

YANG Shunyu, MA Haiqiang ∗ , LI Zhenghua   

  1. YANG Shunyu, MA Haiqiang ∗ , LI Zhenghua
  • Received:2020-04-17 Revised:2021-04-15 Published:2021-11-28 Online:2021-11-28

摘要: 为了探究参考系无关量子密钥分发 (RFI-QKD) 协议下不同光源应对光源强度波动的能力差异, 提出了 一种在非完美光源下参考系无关协议密钥率的理论分析计算方案。考虑常见的量子通信系统参数, 通过计算机 仿真模拟分析对比了量子密钥分发中常用且易于获得的弱相干源 (WCS) 与可预报单光子源 (HSPS ) 以及可预 测相干光源 (HPCS) 在强度波动下的具体表现。结果表明: 强度波动分析方案在参考系无关协议下具有可实现 性, 相比常用弱相干源, 可预报单光子源和可预测相干光源在相同条件下具有更好的性能以及抵御强度波动缺 陷的能力, 其中可预测相干光源具有最佳密钥率和最大传输距离。

关键词: 量子光学, 量子密钥分发, 参考系无关, 诱骗态, 可预报单光子源, 可预测相干光源

Abstract: In order to explore the difference of different light sources response to light source intensity fluctuation in reference-frame-independent quantum key distribution (RFI-QKD) protocol, a theoretical analysis and calculation scheme of RFI protocol key rate under imperfect light source is proposed. Through simulation, the performance of RFI-QKD protocol with weak coherence sources (WCS) is compared with that with heralded pair-coherent sources (HPCS) and heralded single-photon sources (HSPS) under intensity fluctuations with the common quantum communication parameters. The results show that compared with WCS, HSPS and HPCS have better performance and resistance to fluctuations under the same conditions, and predictable coherent light sources show best at any condition. It indicates that the proposed intensity fluctuation analysis scheme is realizable under RFI-QKD, and the simulation results can provide a valuable reference for parameter selection and optimization of RFI-QKD experimental research.

Key words: quantum optics, quantum key distribution, reference-frame-independence, decoy state; heralded single-photon sources, heralded pair-coherent source

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